Fastening for buckets of turbines.



ring may be staked over (UNITED sTnTEs PATE or LYNN, Massief HUSE'TTS,ASSIGNORS A CORPORATION OF NEW YORK.

EASTENING .IOR BUCKETS'O? TBBINES.

Specication of Lettera Patent. y x Application led October 6, 1906.

To all whom it may concern.'

Be it known that we, MAGNUs W. ALEX- ANDER and WERNER JOHNSON, citizensofthe United States, residing at Lynn, county of Essex, State ofMassachusetts, have invented certain new and useful Improvements inFastenings for the Buckets of Elastic-Fluid Turbines, of which thefollowing is a specification.

This invention relates to means for securing the buckets of elasticiiuid turbines to the .bucket wheels or other carriers.

In view of the centrifugal strains developed at high speeds it isnecessary to provide strong and unyielding fastening devices whenseparatelyformed buckets, or segmental bases carrying a plurality ofbuckets, are attached to the periphery of a bucket wheel. In addition toresisting centrifugal strains, provision must be made for holding thebuckets rigidly in a given plane of revolution, since any deflectiontherefrom might wreck the machine by causing/the buckets to strike thestationary intermediates or other parts.

Ourv invention aimsto accomplish the desired results in a simple andreliable manner. To this end, the shank of the bucket, or the segmentalbase su port for a plurality of buckets, is dovetailled or ribbed so. asto eno'age beneath an undercut or' overhanging ange along one edge of agroove in the wheel or other carrier. A segmental clam ing ring isplaced on the other side of t e bucket shank or su port, having a flangesha 'ed to engage wit the dovetail or rib on 'sai shank or support. Thering is received in a dee groove adjacent to the one in which the bucets are supported, and said deep groove is undercut to receive acorresponding projection on. the ring. h In order to retain the ring inplace, a wire is wound into the space `between said rin and the op ositewall of the deep roove. Ell`o assist in reeping the ywire i1 .p ace thewalls of the space into which it is wound are made diverging from top tobottom, and the Wire is preferably/hammered orl calked into said space.rlhe edges of the grooveand the clamping. the outer turn of Eure ctoprevent it from flying out. The coiled Wire presents great resistance tocentrifugal force, and forms a pira'ztcally solid iilling for the spacein which 1t is wound, se

and the bucket or held thereby.

The accompanying dre 'atented April '7, 1908.

Serial No. 337,704.

I that the clamping ring is rigidly supported,

segmental base is firmly .-wlieel inbodying bucl are provided with adove- .tailed or ribbed support 2.

are separately formed, seid lshankvintegral with the blade.

buckets arecut in or li. the buckets li several secured to a segmentalbase, said base constitutes the support, and

is ribbed or ddvetailcrl in the manner shown.

The rim of the wheel or other carrier 3 is grooved to receive drawing,prov1s1on buckets,

the supports 2. ln the 1s made for three rows ci but this number may bediminished or increased as desired.

A smooth surface 4 1s made, upon which the bucket-supports 2 Adjacent tothe surface el a undercut flange 5 itting snugly against ene side ot thedovetailed or ribbed port 2. A clampin portion ci the supg ring 6 isplaced on the opposite side of the support 2, having a Harige 7 whichiits port.

order to keep them provided with a lateral rib a shoulder 9 formed inone snugly against said suprlhis ring is made in segments, and in fromflying oli", i are k3 which n ts under wall oi a deep groove 10 which isturned in the carrier I3 ad- I l rest.

jacent to the surface 4.

The groove is wide dropped into it andv then slid vlaterally to causethe flange .7 to engage with the support 2, and the rib 8 to take underthe shoulder Q.

}. enough to permit the ring segments to be l l 10. Into this spactainer, such as a e is Wound a flexible rewire l1, each turn beinghammered or calked so as to flatten it somewhat andv cause it to abutsolidly against the preferably made I top, so that any tendency o eutunder centriiu i tually resisted. m

| l grcev [sides of the ring and groove. l

l preferably .inclinedl The ring is at its inner layer of wire rests, toThe Walls of is wound are converging toward the ring.

support is a applies to e. single roW of buckets, es shown i at theleft-bend side of the drawing.

When two hucket-supports are used, their clamping rings may be securedby one Wra ping of wire, :is shown et the right-hand si e of the'drawing 'In this case the ienges 5 fece eri-3h' other, and the groove14 for the rings is nearly twice es w'ide es the groove 10,

and is shouldered or undercut in each Wall.A

The Wire is wound in the space between the two rings, and is' oalked'mtopiece and secured by staking the ladjacent edges of the rings et l5. AWire Wrapping of this kind, if composed. of Wire that does not easiiy'stretch, is -capable oi' withstanding very great centrifogel strains.filt, is easily and uickly'applied, and is preferebly Wound unertension, to avoid any chance of looseness or play. It can hereediiyripped out when a. bucket or bucket segment needs to oe removed.

In'acoordenee with, the provisions or" the patent stetutes, Ihave-described the principle of operation ofl my invention, togetherwith the epperetoswhieh new consider to be the best embodiment thereof,but I desire toJ have it understood that the enperatus shown is oeil.,7.illustrative sind that tneinvention con be carried out by other Ineens.

What we cieim es newT and desire to secure by Letters Patent of theUnited States, is,-

l The combination With e. grooved boeketeerrier, of. buckets mountedthereon, and ineens for fastening seid buckets, comprising e iiexihieretainer Wreppedferound seid cer-v rier after the buckets are mounted inplace.

2. The eomoinetion with a. grooved bucketcarrier, ,of lmicnet-supportsmounted thereon,

e clamping ring engaging with seid supports,

end e emoie retainer Wrapped around seid carrier end engaging With sindring.

3. The e rohinetion with a. grooved bucketcerrier, of hncketenpports.engaging there" -with, a clamping rino engaging with seid snpu ports,end e Wire Wound around seid carrier retaining said ring in piece.

4. The combination Withv sgrooved bucket.- ca-rrier iieving en 'undercutflange, oi bucketsupx orte shaped to engage under seid iiange, e.cramping ring having e flange to engage with seid snpeort, and e wireWrapped adjaeent to md engaging with seid ring.

ledge n the carrier in ieyere,

our hands 5. The combination with e. bucket-cerner havin f e iienge end.e groove provided 'with o. shoul er, e bucket-support engegingnnder seidflange, e clamping ring engaging said support and having e rib takingunder seid shoulder, and a. Wire Wound in the groove. adjacent to seidring. f'

6. The combination with o. bucket-carrier having a. groove' providedwith e snoei-der, of a bucket-support on said carrier, e c'amping rinentering seid VGroove and engaging with sei shoulder, en e. wire Woundinto the spaee between seid ring and the Weld of the groove. 'l

7. The ooinbinetion with e. bucket-cerner having s. groove providedWithnu shoulder, of

a. bucketsupport on seid eerrier, e. clamping.

oove end engaging with ri entering sitd sa-i shouider, en e Wire Woundinto 'the space between seidgring' end the Well oi" the groove, seidspecs. having Weils diverging downwardly. 8. 'The combination with e'bucket-carrier havinge groove provided with s. sheet-fier, of e.bucket-support 'on seid carrier, e. demping rin entering seid groove endengsgis g Wi i sai(J shoulder, end e Wire Wound into the space between'seid ring end the Weils of the groove,'seid wire being celked to inekeit abut solidly against the sides of the ring and groove.

9. The combination with e. bucket-carrier having s. groove' providedwith e shouider, of e bucket-support on seid carrier, e clamping seinshoulder,- end. s. wire Wound into the space between seid. ring end theWeli ot the groove, seid rin;Y heving e iienge et its inner on'Whicf.seid Wire rests. f 1G. he eornhinetion, with ffrooved bucket carrier,or' 'buckets mounted t ereon, end a. ilexible retainer which is woundaround eeen ieyer being independently restrained vsgeinst eentriiugelforse.

in Witness whereof, We have herennto set this third dey of October,1965. MAGNUS W. ALENBER. WERNER JQENSGN. Witnesses: l

' Joris' Moi/Lines, Jr., 'A'Lnnn H. RUSSELL.

